Precious stone



FIG. 1 is an illustrative top plan view of a precious stone showing our new design, a bottom plan view also shown looking through the transparent precious stone;

FIG. 2 is an illustrative bottom plan view, a top view also shown looking through the transparent precious stone;

FIG. 3 is a side elevational view, the other sides being a mirror image; and,

FIG. 4 is a bottom perspective view thereof, also showing a top perspective view looking through the transparent precious stone. 

The ornamental design for a precious stone, as shown and described. 